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Equity - Treasury Shares (Details) - ARS ($) $ in Millions | Apr. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | May 21, 2013
--- | --- | --- | --- | --- | --- | ---
Equity |  |  |  |  |  |  |  |  |  |  |
Total equity |  |  | $ 23,879 |  | $ 19,878 |  | $ 17,610 |  | $ 14,769 |  |
Treasury shares (in shares) |  |  | 15,221,373 |  | 15,221,373 |  | 15,221,373 |  |  |  |
Treasury shares, Capital nominal value |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |
Total equity | [2] |  | $ 15 | [1] | $ 15 | [1],[3] | $ 15 | [3] | 15 | [3] |
Maximum time period for sale of treasury shares |  | 3 years |  |  |  |  |  |  |  |  |
Treasury shares (in shares) |  |  | 15,221,373 |  |  |  |  |  |  |  |
Percentage of treasury shares held |  |  | 1.55% |  | 1.55% |  | 1.55% |  |  |  |
Voluntary reserve for capital investments |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |
Total equity |  |  | $ 461 | [2] | $ 3,191 | [2] | $ 3,191 | [2] | 3,191 | [2] | $ 1,200
Treasury shares acquisition cost |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |
Total equity | [2] |  | $ (461) |  | $ (461) |  | $ (461) |  | $ (461) |  |
[1] | As of December 31, 2017 and 2016, total shares (984,380,978), of $1 argentine peso of nominal value each, were issued and fully paid. As of the same dates; 15,221,373 were treasury shares.
[2] | Corresponds to 15,221,373 shares of $1 argentine peso of nominal value each, equivalent to 1.55% of total capital. The treasury shares acquisition costs amounted to 461. See Note 19 - Equity to these consolidated financial statements.
[3] | As of December 31, 2016, 2015 and 2014, total shares ( 984,380,978 ), of $1 argentine peso of nominal value each, were issued and fully paid. As of the same dates; 15,221,373 were treasury shares.

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